Improvement in millstone bushes and spindles



R. S. CATHGART.

Millstone/Bush and Spindles. Y N0. 137,418, 5I PatentedAprilLSS.

UNITED STATES PATENT OFFICE.

RODNEY S. CATHCART, OF CINCINNATI, OHIO, ASSIGNOR OF ONE-HALF HIS RIGHT TO THE STRAUB MILL COMPANY, OF SAME PLACE.

IMPROVEMENT IN MILLSTONE BUSHES AND SPiNDLES.

Specification forming part of Letters Patent No. 137,418, dated April l, 1873; application filed March 15, 1873.

To all whom it may concern:

Beit known that I, RonNEY S. GATHGART, of Cincinnati, in the county of Hamilton and in the State of Ohio, have invented certain new and useful Improvements in Grinding- Mills 5 and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making a part of. this specification, in which- Figure lis a perspective view of a millstone prepared to receive my improved bushing. Fig. 2 is a like view of a spindle with said bushing attached; and Figs. 3 and 4 are vertical central sections of said stone and spindle upon lines passing, respectively, through the driving-lugs of the bushing and through the adjusting-keys.

Letters of like name 'and -kind refer to like parts in each of the figures.

The object of my invention is to render more easy the relative lateral adjustment of the stone and bushing, and to enable said parts to be more firmly connected together than has heretofore been practicable to which eud'it consists principally in the combination of the tapered spindle and the bushing provided with a corresponding opening, substantially as and for the purpose hereinafter specilied. It consists, further, in the means employed for adjusting the bushing to and securing it in horizontal position within the stone, substantially as and for the purpose hereinafter shown.

In the annexed drawing, A represents a spindle, having at and below the point upon which the millstone-bushin g B is to be secured a tapered form, the increase in size being from above downward. The bushing B is provided with a central opening, which corresponds in size and shape to the portion of the spindle A upon which it is to be fitted, and is held in relative circumferential position thereon by means of a key, C, that fits into suitable vertical key-ways provided within the contiguous surfaces of said parts. Exteriorly the bushing has a cylindrical form, has a slight increase in size from its upper end downward, and is provided at its lower end with a flange, b,which extends horizontally outward to a distance somewhat greater than the thickness of its wall. Upon opposite sides of said bushthe bushing B, corresponds in general shapel to the exterior of"the same, and is provided with suitable recesses f for the reception of the drivers D. f

As constructed, the bushing, when placed vwithin the opening F, is adjusted to and secured in a central position by means of four wedges, G, which are driven into the space between the exterior of said bushing and the interior of said opening, after which the relative positions of said parts are insured by filling said opening with molten lead H. y

Although a circular form is preferably employed for the bushing and opening in the stone, a rectangular form may be given said parts, in which event no driving-lugs would be required.

The means employed for centering the spindle and bushing and for securing the same in place within the millstone is simple, inexpensive, eflicient, and durable, while, at the same time, the` spindle can be easily and quickly removed, when necessary, for the purposes of shipment or for repairs. Y

' Having thus fully set forth the nature and merits of my invention, what I claim as new 1sl. In combination with the tapered spindle A, the bushing B provided with a corresponding central opening, and securedin relative circumferential position by means of the key C, substantially as and for the purpose specified.

2. The means employed for adjusting the bushing to and securing it in a central position within the stone E, consisting of the wedges G driven into the space F between said bushing and stone, and the lead. H caused to fill the remainder of said space, substantially as shown.

In testimony that I claim the foregoing I have hereunto set my hand this 13th day of March, 1873.

' RODNEY S. GATHCART. Witnesses:

R. SIMPSON, J. W. BREWSTEE. 

